820447213135 has 8 divisors (see below), whose sum is σ = 1074039988176. Its totient is φ = 596688882240.

The previous prime is 820447213129. The next prime is 820447213139. The reversal of 820447213135 is 531312744028.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-820447213135 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820447213139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7458610974 + ... + 7458611083.

It is an arithmetic number, because the mean of its divisors is an integer number (134254998522).

Almost surely, 2^820447213135 is an apocalyptic number.

820447213135 is a deficient number, since it is larger than the sum of its proper divisors (253592775041).

820447213135 is a wasteful number, since it uses less digits than its factorization.

820447213135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14917222073.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 820447213135 in words is "eight hundred twenty billion, four hundred forty-seven million, two hundred thirteen thousand, one hundred thirty-five".